How to Change the Oil in a 1995 Yamaha YZ250

Shop parts for a 1995 Yamaha YZ250 Dirt Bike.

MotoSport.com Proprietary Guide

If you own a 1995 Yamaha YZ250–a two-stroke motocross legend–regular oil changes are essential for keeping your bike running strong and your transmission and clutch protected. This comprehensive guide walks you through each step, outlines the tools you'll need, and highlights crucial call-outs specific to your YZ250 model year.

Tools and Supplies Needed

  • Socket wrench set (typically 8mm, 10mm or 12mm for drain bolt and covers)
  • Drain pan
  • Funnel
  • Measuring cup (such as Ratio Rite)
  • Shop rags
  • Replacement transmission oil (see recommendations below)
  • New washer for drain bolt (recommended)
  • Torque wrench (optional, for drain bolt)

Recommended Oil and Capacity

  • Type: The 1995 Yamaha YZ250 uses transmission oil–not engine oil, since it's a two-stroke. A synthetic 2-stroke gear oil, like Maxima MTL 80W or an equivalent, works best for clutch and gearbox protection.
  • Capacity: Approximately 750ml (0.8 US quarts). Always check your owner's manual for confirmation or use the fill-level plug as your guide.
    Never overfill–add oil only until it reaches the bottom edge of the sight/check hole.

Step-by-Step: Changing YZ250 Transmission Oil

  1. Warm Up the Bike
    • Start the engine and let it idle for 1–2 minutes, then shut off. This helps thin the oil for a more complete drain.
      Tip: On a two-stroke like the YZ250, transmission oil is separate from premix–so you're only changing gearbox oil, not engine oil.
  2. Place the Bike Upright
    • Use a stand or have a helper steady the bike. Make sure it's as level as possible to ensure full drainage and proper refilling.
  3. Remove the Oil Drain Plug
    • Locate the transmission oil drain bolt at the bottom right side of the engine case (usually 8mm or 10mm).
    • Place the drain pan under the bolt.
    • Loosen and remove the bolt carefully–watch out for the oil draining quickly.
    • Let all old oil drain completely (a few minutes).
    • Inspect both the oil and the drain bolt–look for metal flakes or debris. A small amount of "fuzz" on the magnetic plug is normal; large chunks indicate internal problems.
  4. Replace the Washer and Tighten the Drain Bolt
    • Replace the crush washer on the drain bolt to help prevent leaks.
    • Reinstall the drain bolt by hand first, then snug with the socket. If using a torque wrench, tighten to 7–10 ft-lbs (check your manual for the exact spec).
  5. Remove the Filler Cap
    • This is typically on the top right crankcase cover.
    • Wipe dirt away before removing the cap to keep contaminants out of the gearbox.
  6. Add Fresh Transmission Oil
    • Use the measuring cup to pour in the exact amount (approx. 750ml).
    • Pour slowly using a funnel to avoid spills.
    • On the 1995 YZ250, there's a check bolt (sight bolt) on the clutch cover side–oil should just begin to flow out when you remove this bolt, indicating a full gearbox.
    • If oil comes out before you reach 750ml, stop filling–close the check bolt first, then the filler cap.
  7. Reinstall Filler Cap and Clean Up
    • Double-check all bolts are tight and there are no leaks.
    • Clean up any residual oil and properly dispose of the old fluid at a recycling center.
  8. Start and Cycle the Transmission
    • Start the bike and cycle through the gears while the bike is off the ground (wheel spinning freely).
    • Check for leaks and proper operation of the clutch and gearbox.

1995 Yamaha YZ250 Model-Specific Call-Outs

  • Transmission Fluid Only: On all two-stroke YZ250s (including the 1995), do not attempt to change engine oil–premix in the fuel handles engine lubrication.
  • Drain and Sight Plug Locations: The drain plug is underneath the right side near the water pump cover; the inspection (check) bolt is on the clutch cover above the drain plug.
  • Oil Brand Choice: Choose a high quality, 2-stroke transmission/gear oil (80W or equivalent). Avoid using four-stroke or car engine oil due to potential clutch compatibility issues.
  • Proper Tightening: Always use a new washer on the drain bolt. Over-torquing can strip the case threads (aluminum is soft).

Troubleshooting and FAQs

  • Q: What if I find metal flakes?
    A very fine "fuzz" is normal; large jagged flakes or chunks could indicate serious gearbox or clutch wear.
  • Q: Is dark oil a problem?
    Black or dirty oil means you waited too long between changes–the YZ250's transmission oil should be changed every 5–10 hours of riding (or more often for racing/hard use).
  • Q: Can I use ATF?
    While some riders use Automatic Transmission Fluid (Type F), purpose-made transmission oils offer better protection, especially for longer intervals.

Final Notes

  • Only ever fill to the bottom of the check hole–not beyond. Overfilling can hurt clutch performance and cause leaks.
  • Always follow up with a short ride, then recheck for leaks and fluid level.
  • For extended life, use only reputable oil brands and change often–especially in a high-revving two-stroke like your ’95 YZ250.

Brought to you exclusively by MotoSport.com. Keep your YZ250 riding like new with regular maintenance and enjoy every moto.

Related Shopping Categories

Shop Motor Oil for a 1995 Yamaha YZ250 Dirt Bike.

Shop Oil Filters for a 1995 Yamaha YZ250 Dirt Bike.

Shop Oil Drain Pans for a 1995 Yamaha YZ250 Dirt Bike.

Shop Tools for a 1995 Yamaha YZ250 Dirt Bike.

Shop Oil Fillers and Drain Plugs for a 1995 Yamaha YZ250 Dirt Bike.

Disclaimer: This guide is provided for general informational purposes only and is not intended to replace your motorcycle's official owner's manual. Always refer to your manufacturer's documentation for model-specific instructions, torque specifications, safety procedures, and maintenance requirements. If you are unsure or inexperienced, consider seeking assistance from a qualified mechanic or technician.